Technical data

Linea 24 & 28
21
SECTION 8 SERVICING INSTRUCTIONS
8.1 General
To ensure the continued safe and efficient
operation of the appliance, it is recommended
that it is checked and serviced as necessary at
regular intervals.
The frequency of servicing will depend upon
the particular installation conditions and us-
age, but in general, once per year should be
adequate.
It is the law that any servicing work is carried
out by a competent person such as a Vokèra
service engineer, approved service agent,
British Gas or other CORGI registered per-
sonnel.
The following instructions apply to the boiler
and its controls, but it should be remembered
that the central heating and domestic hot
water systems will also require attention from
time to time.
8.2 Important Notes
WARNING: having carried out preliminary
flame checks and before starting any servic-
ing work, switch OFF the mains electricity
supply and disconnect the plug at the main
isolating switch and socket. (If a switch is used
remove the fuse.)
Turn off gas supply at the gas service tap fitted
to the appliance.
Always test for gas soundness after any serv-
ice work and after exchanging any gas carry-
ing component.
8.3 Recommended Routine Servicing
8.3.1 Annual Servicing
When servicing is required the following pro-
cedures should be carried out.
1. Inspect exterior for signs of damage and
deterioration, particularly of flue pipework
and electrical connections.
2. Turn off mains electricity and remove front
casing (see 8.4.).
3. Replace fuse if previously removed ( 8.2.
above) and turn on electricity. Run the
boiler for a few minutes in the domestic hot
water mode to permit inspection of its
operation. This is accomplished by open-
ing a domestic hot water draw off tap and
inspecting burner for yellowing of flame tip,
flame lift off or sooting.
4. Ensure central heating valves are open.
See 6.3.2.1.
Observe pressure gauge reading (fig. 1,
19) which should be approximately 1 bar
when the system is cold See 6.3.4
5. Turn off mains electricity and turn off gas
service tap on the appliance.
6. Gain general access as described in
8.4.
7. Remove main burner (see 8.6). Lightly
clean with a soft brush and inspect for
damage. If during initial inspection any
combustion irregularity was suspected,
remove injectors and clean or replace (see
8.7).
8. Place cloth below combustion chamber to
catch debris. Clean heat exchanger using
suitable brushes and rods if necessary.
9. Inspect combustion chamber lining. The
insulating material is easily damaged. Do
not scrape, but clean off lightly.
If any panels are damaged these should be
replaced (see 8.11).
10. Replace all parts in reverse order but leave
the controls fascia open and outer casing
off.
11.Undertake a complete commissioning
check as detailed in section 6.
12.Close up control fascia and refix front
casing.
13.Clean off casing using soft cloth and dilute
detergent.
14.Complete details of service undertaken in
the boiler log book.
NOTE: there is a flue gas analysis test
point incorporated in the flue outlet. (see
8.23.6 and fig. 1, 30)
8.3.2 Replacement of Parts
1. The life of individual components varies
and they will need servicing as and when
faults develop. The fault finding sequence
charts in section 9 will serve to locate
which component is the cause of any
malfunction. Instructions for removal, in-
spection and replacement of the individual
parts are given in the following pages.
2. The domestic hot water heat exchanger
may in certain conditions become partially
blocked by scale deposits. Evidence of this
will be deterioration in performance.
This condition could well be treated using
proprietary descalants following makers'
instructions without dismantling the appli-
ance by circulating a fluid through the dhw
coil. To do this, disconnection from hot and
cold services is necessary. Reconnect only
after thorough flushing with clean water.
3. Occasional maintenance of mechanical
working parts will be necessary. Service
kits are available from ypur local Vokèra
stockists.